Blending in poligon Drawing

I’m drawing several small polygons with size something like 0.05 x 50.0 pixels, one near another.
I set some properties
But polygons looks like lines with 100% filling. And sometimes don’t drawn at all (for example: if I shift picture 0.5 pixel)
Software rendering makes all fine with same settings.

are you using glColor4f and setting an alpha value?

I was trying

glColor3ub(color.R, color.G, color.B);


glColor4ub(color.R, color.G, color.B, 255);

with similar results

your alpha value of 255 is setting the alpha of the color to fully opaque.

try knocking that down some.
i.e. a value of 127 should give you polygons with 50% transparency.

I’m expecting antialising, for example:
my rectangular 0.5, 1, 1, 2 will be drawn with 0.5 alpha index because it’s size half of pixel.